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Low amyloid and high tau levels in the cerebrospinal fluid (CSF) have been associated with Alzheimer disease (AD). Two schemas to classify these biomarkers include National Institute of Aging-Alzheimer's Association/suspected non-AD pathology (NIA-AA/SNAP) and the amyloid-tau-neurodegeneration (ATN) frameworks. Investigators conducted an analysis of 814 cognitively normal participants (mean age, about 60; 63% female; mean education, 16 years) from four cohort studies with baseline measurements of CSF β-amyloid 1-42 (A), phosphorylated tau 181 (p-tau181; T) as a marker for tangle pathology, and total tau as a marker for neurodegeneration (t-tau; N). Cognitive performance was assessed every 12 to 18 months via a global cognitive factor score …